sciiwabe



LOUIS IIOFMEISTER AND OTTO E. SCIUVABE, OF NEV YORK, N. Y.

OVERFLOW-ALARM.

SPECIFICATION forming part of Letters Patent No. 395,830, dated January8, 1889.

Application filed July 31, 1888. Serial No. 281,595. (No model.)

.To all whom it may concern:

Be it known that we, LOUIS ITOFMEISTER and OTTO SeHWAnE, both of thecity of New York, N. Y., have invented an Improved Overflow-Alarm, ofwhich the following is a specification.

This invention relates to an alarm which sounds automatically if theliquid in a tank is at its maximum or minimum height.

The invention consists in the various features of improvement, morefully pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of ourimproved overflowalarm. Fig. 2 is a vertical section showing the same inconnection with a tank. Fig. 3 is a detail view of the float, and Fig. ta dctail view of the weight.

The letter a represents a rope passing through a casing or box, I), andprovided on top with a float, c, and at the bottom with a weight, (7,the float being somewhat heavier than the weight. Upon the rope a. thereare aflixed two (more or less) balls or proj ,-0- tions, 6.

Across the box I) thereis hung arock-shaft, g, through which extends aU-shaped stop, f, the shanks of which are at such a distance apart thatthe balls 6 can pass tl'irough them, but not without first impartingmotion to the stop and rocking the shaft.

The shaft g is connected by rod 9' to a spiral spring, 71. Through shaftg there extends also a rod, 1', secured at the top and bottom by wires jto a bell, 7s, suspended from a spring, 072. The operation of the deviceis as follows: The float c is introduced into the tank A and will risewith the liquid therein. The weight d will, as the tank is filled, drawthe rope a downward, and when the maximum height of liquid is attainedone of the balls 6 will be in line horizontally with the stop f. Onpassing through the fork of the stop the ball 6 will press the samedownward, thus rocking shaft g. The motion of shaft y will by rod ycause a contraction of upper part of spring 71. As soon as ball 6 hascleared stop f, the spring 71 will be free to suddenly expand. This willcause the rocking of shaft g, and by it the rod 1 will be oscillated,thus causing the lower wire, j, to ring bell It. If the liquid in thetank A falls, the float 0 being heavier than weight (7, will draw therope a upward. Thus the operation will be repeated, as described, withthe exception that the ball 6 passes through the fork f from the bottominstead of from the top, and that the upper instead of the lower wire,j,will ring the bell.

\Vhat we claim is- 1. The combination of a rock-shaft with a bell asn-in and a sto) all three of which.

are connected to said rock-shaft, and with a rope having a series ofprojections that are adapt ed to engage the stop and rock the shaftagainst the action of the spring, substantially as specified.

2. The combination of a 'roclcshaft with a bell and with a rod '1', andwires j, that connect the bell to the rock-shaft, and with a spring, 71,and stopf, also connected to the rockshaft, and with a rope, (1, havingprojections e, that are adapted to engage stop f, substantially asspecified.

3. The combination of a rock-shaft with a bell, 7;, spring 72, andU-shaped stop f, connected to said rock-shaft, and with a rope havingprojections 6, adapted to engage the stop, and having a float and aweight secured to opposite ends, the bell k being suspended from springm, substantially as specified.

LOUIS HOFMEISTER. OTTO E. SCPHVABE. In presence of F. v. BRIESEN, HENRYE. ROEDER.

